First Post-YS carb identification

New to this forum, but not to old jeeps. I’m in the process of refreshing my 1984 frame up restoration of a 1951 M38 bought from Louis Larson (Willys Mpls). Going over my work of 26 years ago is interesting.

What is the difference between an M38 YS637 carburetor and an YS950 for the M38A1, and how can you tell by appearance? There are no tags or indentifying markings (other than YS) on the one I have.

the m38 carb has a smaller base. Also the throttle shaft is in a different position.

The flange nuts or holes are turned 90 degrees from each other. The two nuts looking at the top curved air horn face front to back of the jeep on the 637, left to right on the A1 or 950. This is with the air horn pointed at the air filter. Early M38's with the 637 have a square knob facing forward cast into the base of the carb. Those carbs are the rarest. They are not cheap to buy or rebuild. Get the newest kit so the rubber diaphrams are compatable with the newer fuels.

Thanks-I do have a 637. The additional early casting is shown in the TM and that threw me off since mine does not have that.

Do we get to see your Jeep?

clinto said:

Do we get to see your Jeep?

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Can we see it please, M38's are my favorite......

nate

Yes, I'll read up on how to post pictures & do so. Right now I'm in the field for work, but will do when I get back next week.

Turns out I have the original early YS637 carb (with additional cast boss) in great shape plus the more recent one. I've been using a CJ3A carb for general use just to save the YS.

The M38 is relatively early (S/N 154XX) built 3-51 with most of the eartly features intact. When restoring it I took off the early bell housing & starter (saved of course) & put in the later sealed housing.

OldManRiver said:

Yes, I'll read up on how to post pictures & do so. Right now I'm in the field for work, but will do when I get back next week.

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I'll save you some looking:

http://www.steelsoldiers.com/forum-tips-tricks/59917-how-post-pictures-tutorial.html